ZHONGSHAN XINRUN PLASTIC PRODUCTS CO., LTD.
ZHONGSHAN XINRUN PLASTIC PRODUCTS CO., LTD. ZHONGSHAN XINRUN PLASTIC PRODUCTS CO., LTD.
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Problems In The Production Of Plastic Packaging Bottles

When designing extruded plastic packaging bottles, which is made up of high density polyethylene or polypropylene, the cross section of plastic packaging bottles should be rectangular or elliptical. For low density polyethylene or other flexible plastic packaging bottles, the cross section should be circular. This facilitates the extrusion of contents from plastic packaging bottles. The plastic parts used in conjunction with the plastic packaging bottle mouth are mainly bottle caps and sealers. The design of plastic packaging bottle mouth should focus on how to make the plastic packaging bottle mouth better match the cap and sealer. The bottom of the plastic packaging bottle is the weak part of the mechanical properties of the plastic packaging bottle. Therefore, the bottom of plastic packaging bottles is generally designed to be concave; the corner and concave parts of plastic packaging bottles are large arc excess. In order to facilitate the stacking of plastic packaging bottles and increase the stacking stability of plastic packaging bottles, inner grooves should be designed at the bottom of plastic packaging bottles.

When the surface of plastic packaging bottle is labeled, the label surface should be smooth. A "frame" can be designed on the surface of plastic packaging bottles, so that the label can be positioned accurately without moving. In blow moulding, the first contact part of billet inflation always tends to harden in advance. Therefore, the wall thickness of this part is also larger. The edge and corner are the last contact parts of billet bloating, and the wall thickness of wall in this part is smaller. Therefore, the edges and fillets of plastic packaging bottles should be designed into rounded corners. The rigidity and bending resistance of plastic packaging bottles can be improved by changing the surface shape of plastic packaging bottles, such as thinner middle part of plastic packaging bottles and increasing circumferential grooves or ribs on the surface of plastic packaging bottles. Longitudinal grooves or reinforcing bars can eliminate the displacement, sagging or deformation of plastic packaging bottles under long-term load.

The printing surface of plastic packaging bottles is the most focused part of consumers' attention. Printing surface should be flat and continuous. If plastic packaging bottle contains handle, groove, reinforcement and other structures, designation of printing operations can not cause inconvenience. Elliptical plastic packaging bottles have higher stiffness, but the manufacturing cost of the mould is higher. Therefore, in order to ensure the rigidity of plastic packaging bottles, besides choosing materials with high rigidity, the rigidity and load-resistant strength of plastic packaging bottles should be strengthened through the shape design of plastic packaging bottles.

Because most plastics are sensitive to notches, plastic packaging bottles are prone to cracks and cracks at sharp corners, the root and neck of the thread at the mouth, so these parts should be designed into rounded corners. For the turning point of rectangular plastic packaging bottle, it is necessary to support most of the load of plastic packaging bottle. Therefore, increasing the wall thickness of rectangular plastic packaging bottle is helpful to improve the rigidity and load-resistant strength of plastic packaging bottle.